Testing glow plugs

Testing and replacing glow plugs should always be left to the experts in the automobile repair shop. Only they have the necessary knowledge and the right equipment.

Time and again there are discussions in forums about removing a glow plug and connecting it to an electrical source to test whether it still glows. Such "testing methods" can cause serious injuries due to burns!

Also, incorrect installation of glow plugs can damage both the glow plug itself and the engine.

Therefore, testing and replacing glow plugs should always be left to the experts in the automobile repair shop. Only they have the necessary knowledge and the right equipment.

Related topics

Testing glow plugs the right way: To correctly test a glow plug, you require a tong-test ammeter in order to check the current draw.

Defects: Defects indicate what is wrong in the engine.

Removing carbon deposits with a reamer: Diesel engines have a tendency towards carbon build-up. If glow plugs are replaced in this case, the glow plug bore should be cleaned with a special tool.

The correct torque: If the incorrect torque is applied to a glow plug, a compression loss can result. The correct torques for all glow plugs are shown here.

Brief instructions for installation and removal: Glow plugs must be replaced with care, using the correct tool and technical expertise. Here are the appropriate tips for this.